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Nexperia USA Inc. TL431BMFDT,215
- Part No.:
- TL431BMFDT,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BMFDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:32,497
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Product details
Overview
TL431BMFDT,215 from Nexperia is a B-grade (±0.5 %) adjustable precision shunt regulator in SOT23 package with mirrored pinning (REF–K–A), operating from −40 °C to +125 °C, delivering 2.483 V to 2.507 V reference voltage at 10 mA cathode current, and supporting programmable output up to 36 V for isolated SMPS feedback loops.
For engineers reviewing the TL431BMFDT,215 datasheet, TL431BMFDT,215 pinout, TL431BMFDT,215 application, or TL431BMFDT,215 equivalent, this device is selected for high-accuracy voltage regulation in automotive-grade power supplies, precision current sinks, and isolated DC-DC converter control where tight Vref tolerance and low dynamic impedance are critical.
Technical Context
The TL431BMFDT,215 implements a bandgap-based 2.495 V reference with internal error amplifier and NPN output stage, enabling three-terminal shunt regulation via external resistor divider. Its mirrored pinout (Pin 1 = REF, Pin 2 = K, Pin 3 = A) distinguishes it from standard SOT23 variants and ensures correct PCB layout in space-constrained designs.
It operates over −40 °C to +125 °C with 0.5 % initial Vref tolerance, 0.2 Ω typical dynamic cathode-anode impedance, and <2.5 μA reference current variation across temperature - enabling stable closed-loop performance in wide-range industrial and automotive power systems without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 2483–2507 mV at IK = 10 mA, Tamb = 25 °C - enables ±0.5 % output setting accuracy in adjustable regulators |
| Cathode-anode voltage (VKA) | 2.495 V to 36 V - supports wide-range programmable output using two external resistors |
| Cathode current (IK) | 1 mA to 100 mA - provides sufficient sink capability for feedback biasing and current-limiting circuits |
| Dynamic impedance (ZKA) | 0.2 Ω typical at f < 1 kHz - ensures minimal output perturbation under transient load changes |
| Reference current (Iref) | 2–4 μA at IK = 10 mA - allows high-value resistor dividers (>100 kΩ) to minimize quiescent power loss |
| Temp. drift (ΔVref) | ±17 to ±34 mV over −40 °C to +125 °C - maintains regulation stability in under-hood or industrial environments |
| Off-state current (Ioff) | ≤0.5 μA at VKA = 36 V - prevents unintended conduction during system standby or fault conditions |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.3 mm footprint, 1.1 mm height; mirrored pinning configuration optimized for compact layout in feedback networks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | REF | Reference input node - connects to resistor divider midpoint; high-impedance (2–4 μA) sensing point for output voltage feedback |
| Pin 2 | K | Cathode - active sink terminal; carries full regulated output current (1–100 mA); connects to supply rail or optocoupler anode in SMPS |
| Pin 3 | A | Anode - return path to ground or low-side reference; completes shunt current loop and sets minimum operating voltage (≥2.5 V) |
Key Features
| Feature | Design Value |
|---|---|
| 0.5 % reference voltage tolerance | B-grade specification ensures ≤12.5 mV absolute Vref error at 25 °C, reducing calibration overhead in precision supplies |
| Mirrored SOT23 pinout | REF–K–A arrangement avoids routing conflicts in dense feedback paths and matches common optocoupler/analog isolator layouts |
| −40 °C to +125 °C operation | Extended temperature range supports under-hood automotive modules and industrial motor drives without derating |
| 0.2 Ω dynamic impedance | Enables fast transient response (<1 µs rise time) and low noise in closed-loop regulation, outperforming discrete Zener+transistor solutions |
| Low 2–4 μA reference current | Permits use of >100 kΩ resistor dividers, cutting divider power dissipation by >90 % versus 10 kΩ alternatives |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495 V reference to drive optocoupler LED; regulates output by modulating photocurrent into primary-side controller. Use Value: Enables ±0.5 % output regulation accuracy across line/load/temperature, meeting Class II medical and industrial safety standards. |
Use Scenario: Constant-current source for LED biasing or sensor excitation in battery-powered instrumentation. IC Role / Device Role / Timing Role: Adjustable shunt element sinking fixed current set by Rsense; anode grounded, cathode connected to load high-side. Use Value: Delivers 1–100 mA sink current with <0.5 % setpoint error and <0.2 Ω output impedance, eliminating need for op-amp + MOSFET. |
| Programmable Voltage Reference | Overvoltage Protection Clamp |
Use Scenario: Configurable reference for ADCs, comparators, or DACs in programmable power supplies. IC Role / Device Role / Timing Role: Three-terminal adjustable reference generating stable 3–30 V outputs via R1/R2 divider; REF pin senses divider ratio. Use Value: Replaces multiple fixed references with single BOM item; 0.5 % tolerance ensures consistent measurement accuracy across product variants. |
Use Scenario: Fast-acting overvoltage clamp on 12 V or 24 V rails protecting downstream ICs and sensors. IC Role / Device Role / Timing Role: Shunt regulator triggered when sensed voltage exceeds threshold; clamps excess energy by sinking current into ground. Use Value: Responds within microseconds with <100 ns propagation delay, limiting transient overshoot to <50 mV above setpoint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | Standard SOT23 pinning (K–REF–A); same 0.5 % Vref, −40 °C to +85 °C rating | Limited to commercial/industrial ambient; unsuitable for under-hood automotive use | Select when board layout permits standard pinout and temperature range ≤85 °C suffices |
| TL431BCDBZR | Standard pinning; 0.5 % Vref; 0 °C to +70 °C operation; lower cost | Restricted to consumer-grade ambient; no extended temp qualification | Choose for cost-sensitive non-automotive applications where thermal margin is adequate |
Compared with TL431BIDBZR and TL431BCDBZR, TL431BMFDT,215 uniquely combines B-grade precision, mirrored pinout for layout optimization, and full −40 °C to +125 °C operation - making it the only option qualified for automotive under-hood feedback loops requiring both accuracy and thermal robustness.
Availability
TL431BMFDT,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinks, and programmable voltage references requiring stable component supply across automotive, industrial, and medical power systems.
Supply support for TL431BMFDT,215 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and discrete components, serving automotive, industrial, and computing markets with AEC-Q100-qualified products.
TL431BMFDT,215 belongs to Nexperia's precision shunt regulator family designed specifically for accurate, low-drift voltage regulation in safety-critical and thermally demanding power conversion applications.
FAQ
What is the pin configuration of TL431BMFDT,215?
TL431BMFDT,215 uses mirrored SOT23 pinning: Pin 1 = REF (reference input), Pin 2 = K (cathode), Pin 3 = A (anode). This differs from standard TL431 SOT23 variants (K–REF–A) and must be verified in PCB layout to avoid functional failure.
Does TL431BMFDT,215 support automotive applications?
Yes - TL431BMFDT,215 is rated for −40 °C to +125 °C operation and was previously AEC-Q100 qualified (Grade 1). Though the Rev. 8 datasheet notes removal of formal automotive qualification status, its extended temperature range and tested reliability make it suitable for under-hood automotive power modules.
How does the 0.5 % Vref tolerance impact design margin?
The ±0.5 % (12.5 mV) Vref tolerance at 25 °C directly limits output voltage accuracy in resistor-programmed configurations. For a 12 V output, this contributes ±60 mV error before resistor tolerance and temperature drift - requiring <0.1 % resistors and thermal-aware layout to achieve ±1 % total regulation.
Can TL431BMFDT,215 replace a Zener diode in existing designs?
Yes - TL431BMFDT,215 replaces Zener diodes in shunt regulator, current sink, and voltage reference roles with superior performance: 0.2 Ω dynamic impedance vs. 10–100 Ω for Zeners, 0.5 % Vref vs. 5–10 % Zener tolerance, and programmable output up to 36 V using two resistors instead of discrete voltage selection.
TL431BMFDT,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431BMFDT,215 FAQ
1.How can I place an order for TL431BMFDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BMFDT,215 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TL431BMFDT,215 reliable?
The price and inventory of TL431BMFDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BMFDT,215 is usually 5 days.
3.What payment methods are accepted for TL431BMFDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BMFDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BMFDT,215?
TL431BMFDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BMFDT,215 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TL431BMFDT,215?
For technical support, including TL431BMFDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BMFDT,215 requirements.
6.How does Aetrix verify that TL431BMFDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431BMFDT,215 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL431BMFDT,215 meets industry standards.
7.What is the process for return or replacement of TL431BMFDT,215?
All TL431BMFDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BMFDT,215, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TL431BMFDT,215 part is unused and in its original packaging.
Return procedure for TL431BMFDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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